Insight into the covalent grafting of organic films onto carbon steel surfaces for protection  

作　　者：Sheng-Juan Huo Li-Hong Chen Chen-Sheng Chu Jian-Hui Fang 

机构地区：[1]Department of Chemistry, Science College, Shanghai University

出　　处：《Chinese Science Bulletin》2014年第10期971-980,共10页

基　　金：supported by the National Natural Science Foundation of China(21103105);the Foundation for University Youth Teachers by the Shanghai Education Committee;the Innovation Fund of Shanghai University(50334040)

摘　　要：The novel use of p-nitrophenyldiazonium tetrafluoroborate salt(GG salt)as a protectant that is electrochemically grafted onto carbon steel has been investigated in0.05 mol L-1H2SO4and 5 wt%NaCl solutions using various corrosion monitoring techniques,such as electrochemical impedance spectroscopy,potentiodynamic polarisation,infrared spectra and scanning electron microscopy measurements.The electrochemical study reveals that this compound is a mixed inhibitor that predominantly controls the cathodic reaction.The surface-grafted film decreases the double-layer capacitance and obviously increases the charge transfer resistance relative to a bare carbon electrode.The values of inhibition effect remain nearly unchanged with an increase in temperature range of 298–318 K.The aryl diazonium is covalently bonded on the steel surface,causing a slight decrease in the apparent activation energy.Overall,the surface-grafted films exhibit excellent inhibition performance in acid and saline solutions within the studied temperature range.The novel use of p-nitrophenyldiazonium tetra-fluoroborate salt （GG salt） as a protectant that is electro-chemically grafted onto carbon steel has been investigated in0.05 mol L-1 H2SO4 and 5 wt% NaC1 solutions using variouscorrosion monitoring techniques, such as electrochemicalimpedance spectroscopy, potentiodynamic polarisation,infrared spectra and scanning electron microscopy measure-ments. The electrochemical study reveals that this compoundis a mixed inhibitor that predominantly controls the cathodicreaction. The surface-grafted film decreases the double-layercapacitance and obviously increases the charge transferresistance relative to a bare carbon electrode. The values ofinhibition effect remain nearly unchanged with an increase intemperature range of 298-318 K. The aryl diazonium iscovalently bonded on the steel surface, causing a slightdecrease in the apparent activation energy. Overall, the sur-face-grafted films exhibit excellent inhibition performance inacid and saline solutions within the studied temperaturerange

关 键 词：Surface grafting- Carbon steel electrode ARYL DIAZONIUM SALT Corrosion INHIBITION Temperature effect 

分 类 号：O621.13[理学—有机化学]